S
M
T
W
T
F
S
29
43°
36°
30
44°
33°
1
43°
33°
2
43°
34°
3
42°
33°
4
41°
32°
5
40°
32°
6
39°
31°
7
38°
31°
8
38°
30°
9
41°
33°
10
42°
31°
11
38°
20°
12
32°
19°
13
30°
19°
14
29°
26°
15
35°
28°
16
39°
27°
17
36°
25°
18
35°
20°
19
36°
22°
20
31°
19°
21
34°
18°
22
29°
24°
23
32°
26°
24
35°
26°
25
35°
27°
26
38°
26°
27
40°
26°
28
39°
25°
29
35°
25°
30
33°
24°
31
32°
24°
1
37°
23°
2
37°
26°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in St. John's
St. John's's December 2026 forecast shows daily high temperatures ranging from 29° to 44°, with overnight lows between 18° and 36°. The average high for December is 37° with an average low of 27°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in St. John's. See also: January | February | March.
